There is an unofficial PwnageTool jailbreak hack for the Apple iPhone 3GS iOS 4.0.2 is out in the open thanks to some hackers, personally we do not recommend trying this but hey that is up to you.
You can see an in-depth guide on how to Jailbreak iPhone 3GS on iOS 4.0.2 with PwnageTool via Redmond Pie, do this at you own risk, we just report the news so do not blame us. This will only work with your iPhone 3GS, the one with the old bootrom only.
You can download the unofficial PwnageTool right here, if you do download please let us know how you got on and if any problems have arisen.
Would you really try the above? If you do good luck, we will keep you updated on the results of iPhone users comments.
Source – TiPB